Eccentric Pin and Sleeve Assembly for Hole Clearance Compensation
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Solution Overview
Problem
Existing connection methods for mechanical parts in aircraft assembly struggle to quickly and cleanly compensate for play due to imperfect geometries and alignment errors, often requiring adjustment operations or drilling.
Innovation Solution
A connection device featuring an eccentric pin and sleeve with non-coaxial cylindrical segments, allowing adjustable tolerance compensation through rotational positioning, which is then locked using locking elements, enabling a quick and clean assembly without the need for adjustments or drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional connection methods are used for mechanical parts, then the assembly process requires adjustment operations or drilling to compensate for play, but this increases assembly time and complexity
Solution Approach 1:
The eccentric pin and sleeve are pre-configured with non-coaxial cylindrical segments that automatically compensate for alignment errors and play between parts during insertion, eliminating the need for post-assembly adjustments or drilling operations
Solution Approach 2:
The invention changes the geometric parameters of the connection elements by using non-coaxial cylindrical segments with different axes of revolution, allowing the connection device to adapt to varying alignment conditions and compensate for play without requiring precise pre-alignment
2Manufacturing precision
If conventional connection methods are used for mechanical parts, then the assembly requires adjustment operations to compensate for play, but this increases device complexity
Solution Approach 1:
The connection device is segmented into distinct functional elements: an eccentric pin with non-coaxial cylindrical segments and an eccentric sleeve with corresponding non-coaxial segments, where each segment performs a specific function in compensating for play and enabling quick connection
Solution Approach 2:
The eccentric pin and sleeve act as intermediary elements between the two mechanical parts, absorbing and compensating for geometric imperfections and alignment errors through their non-coaxial segment design, thereby simplifying the overall connection process
3Manufacturing precision
If conventional connection methods are used for mechanical parts, then drilling is required to achieve clean assembly, but this increases assembly time and loses material
Solution Approach 1:
The non-coaxial cylindrical segments of the eccentric pin and sleeve are designed to automatically compensate for play and achieve clean assembly during the insertion process itself, eliminating the need for subsequent drilling operations that would otherwise be required to secure the connection
4Productivity
If adjustable tolerance compensation is implemented through rotational positioning, then assembly becomes quicker and cleaner, but the device structure becomes more complex
Solution Approach 1:
The invention employs asymmetric non-coaxial cylindrical segments where the axes of revolution differ, creating an inherently asymmetric geometry that enables rotational positioning for tolerance compensation while maintaining a relatively simple overall device structure
Solution Approach 2:
The connection device incorporates dynamic elements that allow rotational movement of the eccentric pin and sleeve during assembly to achieve proper alignment and tolerance compensation, after which locking elements fix the position, providing both adaptability and stability
Data Source
AI summary
A single shear attachment device with an eccentric axis and an eccentric sleeve, a mechanical assembly including such a device and an assembling process. The attachment device includes an eccentric axis as well as an eccentric sleeve intended to be mounted on the eccentric axis in order to correct, by an appropriate positioning in rotation of the eccentric sleeve on the eccentric axis, the possible clearance between superposed circular holes of mechanical components that have to be linked together by means of the attachment device, the attachment device also includes blocking means configured to be able to block in rotation the eccentric axis and the eccentric sleeve, said attachment device thus allowing to generate a quick and clear attachment, that is able to correct clearances locally.